Renesas AT25DQ161-SH-T

Overview

AT25DQ161-SH-T from Renesas Electronics is a 16-Mbit serial Flash memory IC with SPI interface, Dual-I/O and Quad-I/O support, 85 MHz max read frequency, 512/528-byte configurable page size, and two independent 512/528-byte SRAM buffers enabling concurrent write-and-reprogram operation - used in embedded firmware storage, boot code retention, and real-time data logging systems.

For engineers reviewing the AT25DQ161-SH-T datasheet, AT25DQ161-SH-T pinout, AT25DQ161-SH-T application, or AT25DQ161-SH-T equivalent, key selection considerations include SPI mode 0/3 compatibility, RapidS™ high-speed timing, ultra-deep power-down current (500 nA), sector lockdown security, and OTP security register configuration.

Technical Context

The AT25DQ161-SH-T implements a dual-buffered DataFlash architecture with separate main memory array and two SRAM buffers, allowing simultaneous buffer write and main memory page program operations. Its command set supports legacy SPI, Dual-I/O, and Quad-I/O read/write modes with distinct opcodes for each.

It features hardware- and software-controlled sector protection, 128-byte OTP security register (64 bytes factory-unique ID + 64 bytes user-programmable), and programmable page size configuration via dedicated commands - all managed through standard SPI transactions without external address lines.

Key Specifications

Pinout & Package

AT25DQ161-SH-T is packaged in an 8-lead 150-mil narrow SOIC (JEDEC MS-012AA), with pin 1 marked by notch or dot. All pins are CMOS-compatible and support 3.3 V logic levels.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial Flash memory applications.

Compared with W25Q16JVSNIQ and MX25L1633FZBI-10G, the AT25DQ161-SH-T uniquely delivers concurrent buffer write + main memory program capability, 2.3 V operation, and RapidS™ timing - making it optimal for streaming data acquisition and low-voltage embedded boot systems where latency and power co-design are critical.

Availability

AT25DQ161-SH-T is available at Aetrix Electronics and suitable for industrial firmware storage, secure boot loader implementation, and real-time data logging requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for AT25DQ161-SH-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics is a global semiconductor manufacturer specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and infrastructure markets.

The AT25DQ161-SH-T belongs to Renesas' DataFlash family, designed specifically for high-reliability, low-power sequential-access storage in resource-constrained embedded systems requiring concurrent data buffering and secure firmware management.

FAQ

What is the default page size configuration for the AT25DQ161-SH-T?

The AT25DQ161-SH-T ships with 528-byte pages configured as the default setting. This aligns with standard DataFlash formatting and supports legacy firmware tools. Users may reconfigure to 512-byte pages using the Buffer and Page Size Configuration command (0x3D), and the setting persists through power cycles. The AT25DQ161-SH-T's page size is fixed per unit at order time but can be modified in-system if pre-configured for flexibility.

Does the AT25DQ161-SH-T support true Quad-SPI (QSPI) protocol with four data lines simultaneously?

Yes, the AT25DQ161-SH-T supports true Quad-output and Quad-input operations using dedicated opcodes (e.g., 0x6B for Quad-output read, 0x38 for Quad-input buffer write). It uses standard SPI pins repurposed in Quad mode - SI and SO become IO0 and IO1, while WP# and HOLD# become IO2 and IO3 - requiring no additional physical pins beyond the 8-lead SOIC package. The AT25DQ161-SH-T achieves 85 MHz in Quad-I/O mode with verified timing margins.

How does the AT25DQ161-SH-T handle power-loss during a page program operation?

The AT25DQ161-SH-T incorporates automatic write abort detection and status flag reporting. If V_CC drops below the lock-up threshold during programming, the internal state machine halts, and the Status Register (bit 0) indicates "Write In Progress" remains set until cleared. No partial page corruption occurs - the affected page retains its pre-program state. Recovery requires issuing a Read Status Register command followed by appropriate erase before retry. This behavior is guaranteed across all AT25DQ161-SH-T units.

Can the 128-byte OTP Security Register in the AT25DQ161-SH-T be reprogrammed after initial write?

No - the 128-byte OTP Security Register in the AT25DQ161-SH-T is one-time programmable. The first 64 bytes are factory-programmed with a unique 64-bit identifier and cannot be altered. The remaining 64 bytes are user-programmable once; subsequent write attempts to any bit return a "Write Protection Error" (Status Register bit 3 = 1). Lockdown of individual sectors - including the security register area - is enforced via dedicated Sector Lockdown commands (0x3A), and freeze functionality prevents further changes.

Is the AT25DQ161-SH-T pin-compatible with earlier AT45DBxx series devices?

No - the AT25DQ161-SH-T is not pin-compatible with AT45DBxx-series devices. While both share the same 8-pin SOIC footprint and basic SPI signal mapping (CS#, SI, SO, SCK, WP#, RESET#, HOLD#, VSS), the AT25DQ161-SH-T introduces Quad-I/O functionality requiring WP# and HOLD# to serve as IO2 and IO3 in Quad mode, and its command set (e.g., RapidS™ opcodes, buffer configuration) differs significantly. Direct replacement would require firmware and timing validation. The AT25DQ161-SH-T is a functionally enhanced successor, not a drop-in upgrade.